Antennae relatively short, 4- to 9-segmented.
Bead-like (moniliform) or filiform (in some )
The families of thrips are separated largely by the
characters of the antennae, particularly the number
of antennal segments and the nature of the sensoria
on the third and fourth segments.
Thrips have asymmetrical mouthparts that are also
unique to the group.
The right mandible of thrips is reduced and
vestigial and in some species completely absent.
The left mandible is larger, and forms a narrow
stylet used to pierce the cell wall of tissues.
Some species may then inject digestive enzymes as
the maxillary stylets and hypopharynx are inserted
into the opening to drain cellular fluids.
This process leaves a distinctive silvery or bronze
scarring on the surfaces of the stems or leaves
where the thrips feed.
The wings are modified into strips or rod-like
structures & fringed with long hair.
Strap-like two pairs of wings nearly equal, and are
very thin with little venation and a lot of hairs
making a fringe around the edge, which is why they
were named Thysanoptera.
All Three pairs are Ambulatory or Walking legs.
Tarsi 1-2-segmented, with 1-2 claws and are
bladder-like at the end.
The abdomen is elongated and generally flattened
dorso-ventrally, especially in the Tubulifera (Suborder).
There are 10 distinctive segments with a rudiment
of the 11th.
The male genital organs are composed of paired
appendages and an unpaired copulatory organ
(aedeagus), all of which retract into the abdomen.
The paired testes and accessory glands with their
ducts occur in the posterior half of the abdomen.
The female usually has an ovipositor composed of
two pairs of sawlike blades.
There are eight egg sacs (ovarioles) and spherical,
often pigmented, seminal receptacle for storage of
sperm acquired during mating.